Type-writing machine.



G. H. BROWN.

TYPE WRITING MACHINE.

APPLICATION FILED JULY 8, 1911.

1,1 18,101. Patented Nov. 24, 1914.

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ATTQRNE UNITED STATES PATENT OFFICE.

CLARENCE H. BROWN, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO UNDERWOOD TYPEWRITEB COMPANY, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE.

TYPE-WRITING MACHINE.

Application filed July 8, 1911.

To all whom it may concern:

Be it known that I, CLARENCE H. Bnowiv, a citizen of the United States, residing in Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Type- Writing Machines, of which the following is a specification.

This invention relates to the paper-feeding devices of typewriting machines.

As a means for securing accurate feed of the work sheet around the platen both at the line-space operation and at other times, I provide means for assisting the rotation of the paper-feeding rolls which usually run upon the platen. Heretofore, a gear has been fixed to the platen, and pinions which run in mesh with said gear have been fixed to the said pressure rolls, with the result that said rolls were positively driven.

According to my improvements, the pinions are positively connected to the shafts, but the pressure rolls are loose upon the shafts, so that they are not positively driven by said pinions. The pressure rolls tend to turn by reason of their contact with the platen, and they are also urged by the ro tation of the shafts within the rolls; and the shafts may be of relatively large diameter for this purpose.

By means of this invention, each pressure roll, of which there are usually six, is caused to rotate with the platen independently of the other pressure rolls, thereby avoiding the effect of all unevenness and irregularities of rolls or platen, which would otherwise tend to skew the sheets. Since the shafts are not fixed to the rolls, and the latter are not under the positive control of the shafts, no difficulty arises by reason of the greater diameter of the revolving mass when many work sheets are placed at the same time in the machine, since the rolls may run upon the enlarged mass or body independently of the shafts though they may be frictionally driven or urged by the shafts with a sort of slip.

Inthe accompanying drawings, Figure 1 is an end view of the platen and rolls. Fi 2 is an enlarged view of a pressure roll wit its shaft, illustratin diagrammatically the A loose connection of t e two. Fig. 3 is a sectional longitudinal view of a series of pressure rolls and the shaft on which they are loosely mounted for independent rotation.

Specification of Letters Patent.

Patented Nov. 24, 1914.

Serial No. 637,526.

The usual cylindrical platen 1 is fixed upon. an axle 2 which is journaled at its ends in the ends 3, of a platen frame, which also comprises a paper shelf 5 and a tie rod 6, Fig. 1; said platen frame mounted upon a carriage 7. Front and rear pressure rolls 28, 29 run upon the under side of the platen 1,

\ being carried upon shafts 30, 31, held in sets of arms 32, 33 hinged upon the rod 6, and pressed against the platen by spring 34. As seen at Fig. 4, several rolls are placed along each shaft, being separated by tubular spacers 35. Connected to the ends of the shafts are pinions 36, 37, meshing with a gear 38, the latter fixed upon the platen axle 2.

The roll shafts 30, 31 are made flexible at their ends adjacent to the pinions, to permit the rolls to move from the platen without disturbing the pinions. A universal joint or connection comprises a short shaft 39 pivoted at 40 to the hub of the pinion 36, and pivoted at 41 to the end of the shaft 30. The shaft 31 may be similarly connected to its pinion 37. A bracket 41 upon the platen frame carries the pinions.

Each pressure roll is loose upon its shaft, as indicated diagrammatically at Fig. 2, where the diameter of the shaft 30 or 31 is represented as less than the diameter of the bore 42 in the roll. Owing to the pressure between the shaft and the rolls, the shaft, when the platen rotates, tends to turn the rolls to correspond with the motion of the platen; but the shaft does not control any of the rolls, and one may turn independently of the other. Hence if there should be any irregularity in the shape of either the platen or any of the rolls, or if from any cause one roll should tend to be turned by the platen or the paper thereon faster than another roll, the roll-shaft would not unduly oppose such tendency, and hence there would be no liability of skewing or slipping of the paper on the surface of the platen. r e

The feed rolls 28, 29, not only tend to be driven by contact with the platen itself, but there is also independent means 38, 36, 37, 31,'going from the platen to each of the rolls 28 and also to each of the rolls 29, for tending to rotate each individual roll independently of all the others, but without controlling any roll.

Variations may be resorted to within the scope of the invention, and portions of the improvements may be used without others.

Having thus described my invention, I claim:

1. Ina typewriting machine, the combination with a revoluble platen, of pressure rolls, and shafts on which said pressure rolls are loosely mounted, so as to be urged to rotate thereby with a slip connection merely, said shafts geared to said platen.

2. In a typewriting machine, the combination of a revoluble platen, a series of independently rotatable rolls extending along the platen, a shaft on which said rolls are loosely mounted so as not to be entirely rotatably controlled thereby, a pinion connected to said shaft, and a gear connecting said pinion to said platen.

In a typewriting machine, the combination of a revoluble platen, a series of independently rotatable rolls extending along the platen, a shaft on which said rolls are loosely mounted so as not to be entirely rotatably controlled thereby, a pinion connected to said shaft, and a driving connection between said shaft and said platen.

4. In a typewriting machine, the combination with a revoluble platen, of a pressure roll, a revoluble shaft or member on which said pressure roll is supported, said roll being revoluble independently of said revoluble member though frictionally driven thereby, and means connected to the platen for driving said revoluble member.

5. In a typewriting machine, the combi- Miami nation of a revoluble platen, a shaft geared to the platen, a series of rolls mounted independently of each other on said shaft, each roll being loosely mounted, so as to be rotatable independently of the shaft though frictionally driven thereby, and a driving connection between said shaft and said platen. v

6. The combination of a revoluble platen, a gear connected thereto, a pinion meshing with said gear, a series of independently rotatable pressure rolls, a shaft on which said pressure rolls are mounted, and a universal joint or connection between said shaft and said pinion, topermit the shaft to move to and from the platen, said rolls being mounted loosely on said shaft to rotate independently thereof though in part driven thereby.

7. In a typewriting machine, the combination with a revoluble platen, of a series of pressure rolls, a revoluble shaft or member on which said pressure rolls are supported, said rolls being revoluble independently of each other and of said revoluble member, though frictionally driven thereby, and means for driving said revoluble member.

Gus. SWENsoN, M. F. GLENNON. 

